Refresh dashboard and statistics caches immediately after reading history,
projection, reset, import, and shared deletion changes. Coalesce bulk
notifications while keeping committed changes visible to concurrent reads,
and isolate listener failures from successful writes.
Skip unchanged Hardcover attempt updates and protect cache generations
against stale in-flight loads. Cover date edits, projection-only resumes,
rollback, bulk failures, user scope, and cache races with regression tests.
Ref #1695
neon